Problem $5\mathrm{.}90$

The two $3-$ft$-$long shafts are made of $2014-16$ aluminum. Each has a diameter of $1\mathrm{.}5$ in $.$ and they are connected using the gears fixed to their ends. Theftijother ends are attached to fixed supports at A and $B.$ They are also supported by bearings at $C$ and $D,$ which allow free rotation of the shafts along their axes. $($Figure $1)$ A torque of $T=630lb*ft$ is applied to the top gear as shown.

Figure

$1$ of $1$

Determine the maximum shear stress in shaft $AC.$

Express your answer to three significant figures and include appropriate units.

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